Iron(III) complexes of 2-acetylpyridine-4-phenyl-3-thiosemicarbazones: Magnetic,E.s.r. and spectral studies |
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Authors: | Satendra K. Jain Bhagwan S. Garg Yudhvir K. Bhoon |
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Affiliation: | (1) Department of Chemistry, University of Delhi, 110007 Delhi, India;(2) Sri Venkateswara College, Dhaula Kuan, 110021 New Delhi, India |
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Abstract: | Summary Iron(III) complexes of 2-acetylpyridine-4-phenyl-3-thiosemicarbazone (LH) with the general formulae FeLX2 (X = Cl, Br, NO3 or SCN) and FeLSO4 have been prepared and characterised by elemental analysis and by magnetic measurements in the polycrystalline state in the 77–298 K range and by electronic, i.r. and e.s.r. spectra. The FeLX2 species (X = Cl, NCS or NO3) are square pyramidal of intermediate spin-state (S=3/2) with an4A2 ground state. The magnetic behaviour of FeLSO4 is commensurate with high order effects coupled with antiferromagnetic exchange interactions. FeLBr2 is a spin-free dimer involving bromine bridging between two FeLBr2 square pyramids. However, the low-spin species [FeL(DMF)3]2+ exists in dimethylformamide solution. |
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